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Surface controlled subsurface safety valves

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Surface controlled, subsurface tubing safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Systems and methods for mitigating annular pressure buildup...

Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate

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